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When you're out working up a sweat, you want a tight that has comfort and breathability built into every aspect and one that's made to stretch and move with you.

When burning up trail miles, our alpine tech tight keeps pace whether running, riding or traversing. Built with brush-resistant nylon and exceptional spandex flexibility, the Fortis™ Stretch Interlock fabric also delivers odor-resistance and wicking performance during dark-to-dusk circuits or point-to-point workouts. Fit for recovery during the longest days, resistance when the travel gets tough and endurance to match trail running epics such as Leadville races, Rim-to-Rim projects or Wonderland Trail circuits. A solo seven-inch thigh pocket stows cards, keys or a small phone for critical comms.

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 Image Fortis™
Fortis™ Stretch Interlock, 69% Nylon, 31% Spandex, 200g/m2 with Moisture Management and Antimicrobial Treatment

Fortis™, built with stretch interloc technology, is an extremely flexible nylon/spandex fabric. Its sueded finish offers a soft handfeel while moisture management and an antimicrobial treatment improves comfort and reduces odor during any active pursuit.

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As caretakers of the mountain life, we recognize our responsibility to support organizations and people who share our vision to drive positive change for people and the planet. We’re proud to partner with some tremendous organizations in their missions to responsibly advance outdoor recreation and protect our wild surroundings.


We are committed to building garments that are durable, timeless and continue to perform season after season. Over 50% of our product line incorporates preferred materials, which include organic cotton, recycled materials and responsibly-sourced down. We are committed to growing our preferred materials usage to 75% by 2025 and to completely eliminating PFAS from our garments by 2025.

Stio Second Turn®

Our apparel is built to last. As a part of our efforts to reduce waste and keep more gear in the mountains where it belongs, our home-grown gear renewal program allows previously-used items to be traded in, cleaned, repaired and circulated back into use.

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Fabric Details
  • Nylon spandex blend with moisture management and antimicrobial treatment for quick wicking and odor control
  • Elastic loop at back waist to stash your shirt when you need to shed a layer
  • Flatlock seams for comfort and easy layering
  • Custom Stio® drawcord at waist adjust can be worn inside or out
  • Security pocket on thigh
  • YKK® semi-locking slider at thigh pocket for security
Weight and Measurements
  • Weight: 7 oz.
  • Inseam: 28 1/4"
Other Details
  • Reflective heat transfer Stio® logo
  • Imported
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